Grammatically very good, however 破格 doesn't fit this context. Perhaps 特別 would be better.
破格 is usually used for a price, a deal or a treatment. "To the person at the most special bargain for me" is obviously not what you want to say, you know

者 is also not recommendable here. "...者" is kind of an impersonal, unemotional expression and it often appears in legal texts or a company's official announcements.
Actually "愛しい人" is very idiomatic and suitable for love letters, so keep it!